Handheld lantern



FIG. 1 is an upper front left perspective view showing my new design;

FIG. 2 is a left plan view thereof;

FIG. 3 is a right plan view thereof;

FIG. 4 is a front plan view thereof;

FIG. 5 is a rear plan view thereof;

FIG. 6 is a top view thereof; and,

FIG. 7 is a bottom view thereof. 

The ornamental design for a handheld lantern, as shown and described. 